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Method for treating process condensate

  • US 5,643,420 A
  • Filed: 10/06/1995
  • Issued: 07/01/1997
  • Est. Priority Date: 09/03/1993
  • Status: Expired due to Fees
First Claim
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1. A method for treating a chemical production plant process effluent stream of dilute contaminants, said method comprising the following steps:

  • stripping at least a portion of contaminants from a process effluent obtained from a chemical production plant, wherein said stripping is conducted in a stripping section to obtain a contaminant-rich vapor stream and an aqueous bottom stream of reduced contaminant content;

    rectifying said contaminant-rich vapor stream in a rectification section to obtain a concentrated overhead stream;

    condensing said concentrated overhead stream to obtain contaminant-rich overhead condensate and non-condensed gases comprising trace amounts of the contaminates;

    scrubbing said non-condensed gases so as to recover a portion of said trace amounts of the contaminates into said contaminant-rich overhead condensate;

    recycling said overhead condensate to said rectifying step to form a closed loop so as to build up the concentration of contaminants in said overhead condensate;

    separating and withdrawing from said closed loop a fraction of said overhead condensate; and

    reusing said fraction of the overhead condensate in the chemical production plant.

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